1 NOTE: An error in the 1960 rural population count was discovered after the publication of CPH-2-1 from the 1990 Census. 2  The correct 1960 rural population using the 'Current urban definition' is 54,054,425.
Tyr (-5). Phe (-5). Role in structure: Glycine is a very unique amino acid in that in contains a hydrogen as its side chain (rather than a carbon as is the case in all other amino acids). This means that there is much more conformational flexibility in glycine.
According to a textbook on bone disorders,2 proline and glycine play starring roles in the collagenous fibers built from gigantic proteins containing some 1,000 amino acids each. Glycine contributes one-third of the total aminos. Glycine is a tiny amino with a talent for structuring very tightly packed chains.